<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      (function () {
        /*
           match检索正则
                */
        const paragraph = 'Hi Nihao';
        const regex = /[A-Z]/g;
        const found = paragraph.match(regex);
        console.log(found); // ['H', 'N']
      })();
    </script>
  </body>
</html>
